I know it's an audio round, but the graphics are really nice, too. Simple to understand and play. I love that the clock is just a distraction, but it really helps onboard players. One nit: I'd press space to advance after each round, and then instinctively hit space when the "Round 4" type of window appeared, and I'd end up shooting into the ground (I think?) So it might be better to require the player to click space to start the clock going. Also, some old timey music could be fun to experiment with to up the atmosphere. Nice work!